<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Document</title>
  </head>
  <body>
    <script>
      function fn(num1, num2) {
        return num1, num2;
      }
      console.log(fn(1, 2));		// 输出结果：2
    </script>
  </body>
</html>